#EEVBlog #video about PCB #manufacturing #toread. #electronics #hardware
on 02026-09-03#EEVblog #video about jellybean #op-amps #electronics #hardware #toread
on 02026-08-20#EEVblog #video about a #TI NE5532 (but not NE5534) revision that sounds like TI stopped caring about quality. They cut the absolute maximum voltage from ±22V to ±18V and cut the slew rate in half from 9V/μs to 5V/μs, and also entirely dropped the specs for things like crosstalk. Dave also says they’ve changed the frontend topology from npn differential pairs to pnp differential pairs, which seems like it could affect a lot of things like the common-mode range and the sign of the input bias current. It’s probably among TI’s top 20 sold op-amps. It’s like a supply-chain counterfeiting problem, except it was launched by TI against their own customers! Whenever you order TI NE5532s you won’t know if you’re getting the old higher-quality parts or the new parts that may blow up on ±20V rails.
on 02026-06-02#EEVblog #electronics #video #toread about bypass capacitors (overview)
on 02026-05-29#EEVblog #electronics #video #toread about bypass capacitors and whether you can remove them
on 02026-05-29#EEVblog #electronics #video from 8 years ago visualizing the effects of bypass capacitors, including 1GHz low-inductance oscilloscope probing and making transmission lines out of copper tape. Some aspects of this video feel like they're from 30 years ago. 5-volt logic, film bypass capacitors, through-hole components. Finally at 17'27" he solders in a 2.2nF 1206 bypass cap, which does a great job. He’s using a 1MHz quartz crystal oscillator (5 divisions per cycle at 200ns per division) with an HCMOS line driver built in; a lot of the ground-bounce action is like 240MHz (4.8 cycles of ringing in 5 divisions at 4ns/div at 11'26", for example.) He gets the high-frequency return paths wrong, though.
on 02026-05-29#EEVblog #video about counting photons from #LEDs
on 02026-05-27#EEVblog #video on #CH32V003 #microcontrollers, documenting his half-hour to get the thing up and running, in January 02023, when it only cost 10¢. #electronics #hardware
on 02026-05-24#EEVblog #video on using x10 oscilloscope probes containing piezoelectric capacitor #electronics as acoustic vibration sensors
on 02026-04-27#EEVblog #video about partially repairing a mostly-working Hameg 20MHz analog oscilloscope he bought at auction for US$19, largely by spraying contact cleaner into it and replacing a fuse. It has some digital storage capabilities and the service manual online.
on 02026-04-27#EEVblog #video reviewing an Alientek DM40C multimeter with trend chart and a 50MHz oscilloscope and stuff. It looks fucking amazing. #electronics #toread
on 02025-12-21#EEVblog 1718 #video on high-speed probing of #electronics with #oscilloscope probes with a 1kΩ resistor soldered onto a BNC RG-174 cable as your probe tip (a so-called “Z0 probe”), thus putting 1kΩ between your circuit and the cable’s capacitance, with hopefully a much lower parasitic capacitance than a normal o-scope probe, maybe 1pF instead of 13pF. But your DC input impedance is still only 1kΩ rather than 1MΩ or 10MΩ, so you can, for example, load down tri-stated buses much more. And you need a 50Ω termination for your scope cable. But they tolerate longer ground leads than an active FET probe.
on 02025-11-24#EEVblog forum about the μTimer project, where he is going to use #low-power #LCD #displays from #good-display #electronics #hardware
on 02025-10-13#EEVblog #video about #low-power #LCD #displays (like 14.3μA at 3.3V, up to 25μA during updates, 2.9" diagonal and 384×168) and why he prefers them to #e-ink: e-ink takes tens or hundreds of milliamps for a second or two to update. And service life is only 5 years or 10 million switches. He’s going to try the nice high-resolution ST7305-based #good-display.com (Dalian Good Display Co., Ltd.) reflective active matrix TFT LCD, even though the MOQ is 1000, because they sent him a demo board. It’s a nice high-contrast black and white and a very wide viewing angle despite (I think?) not being #memory-LCD. @mikeselectricstuff says the ST7305 datasheet says it supports up to 30Mbps over SPI. @afreestone101 says that if you peel the polarizer layer off the memory LCDs, the black color becomes mirror shiny. #electronics #hardware
on 02025-10-12#EEVblog #video #toread on constant-current sources. #electronics
on 02025-05-28#EEVblog #video on identifying a blown SOT23 dual-diode from a board photo
on 02025-02-05#EEVBlog mailbag #video about Forrest Mims, piezoelectric transducers, Simpson panel voltmeters from 01976 with Panaplex 7-segment neon displays, an RF tank level sensor teardown (it sweeps a VCO to find nulls, comparing the tank reflection to a reflection from a known length of coax to avoid having to calibrate the VCO), and mostly a Tomlov “4K AF Max” microscope
on 02024-09-18#EEVBlog forum thread about #Padauk #microcontrollers #hardware #electronics
on 02024-09-07#video #EEVBlog about oscilloscopes and designing test engineering #electronics instruments
on 02024-08-27#EEVblog #hardware review of a US$25 multimeter, the Aneng AN8008, which is autoranging. He bought it on AliExpress. Same size as the Fluke 101. Has a falsified “1000V” voltage rating on the outside but only 250V fuses on the inside. He complains about the absence of safety measures like MOVs, though he does find a PTC resistor, and the terrible quality of the solder joints. But he really likes its large, high-contrast digits and “awesome” microvolt resolution, and verifies that it really is accurate to within about three parts in ten thousand, except for low ac voltages. It can measure capacitors too. It can generate a square wave at 50–5000Hz and also has a frequency counter, though it gives wrong answers above a few megahertz unless the signal is at least 150mV. Confusingly, the milliamps jack is the amps jack, not the volts and ohms jack. You can turn a backlight on. He says it’s missing the 10mA and 100mA ranges; if I understand right, if you want to measure over a milliamp you have to do it on a 1-amp range which only gives you milliamp precision.
on 02024-04-14#EEVblog how to set up an electronics #hardware lab #video
on 02024-04-05#EEVblog photocopier teardown #hardware #hoarding #video #toread
on 02024-04-04#EEVblog teardown of a CCD scanner array from a fax machine. He mentions at about 2’20" that people complain when he pronounces “LEDs” as [lɛdz]. Most of the video is microscope footage. There’s a massive array of tiny lenses which he describes as “kind of like an optical zebra strip”, which seems fair, but it turns out it’s called a “rod lens array”; the lenses are something like ten times as thick (5mm) as they are wide (0.5mm?), so presumably what they’re doing is putting a virtual image of the page very close to, or on, the CCD itself. The 25 or so transistors attached to each pixel of the sensor array makes me wonder if it’s maybe actually a CMOS sensor rather than a CCD, since a CCD can serve as its own shift register. #hardware #video #optics #electronics
on 02024-04-04#EEVblog salvaging parts from #inkjet printers (HP Officejet Pro 8710) to reuse; specifically the power supply (32V at 1095mA or, in sleep mode, 12V at 170mA), four conveniently mounted infrared photosensors, ferrite beads, coin cells, through-hole inductors, a relay, high-voltage suppression caps, a surface-mount pulse transformer for power supply feedback, an LCD screen with flat-flex cable and IR LEDs around it for the IR touchscreen, linear scanning array (CCD?), dc motor with relative optical encoder, linear rod for the carriage, lots of T10 Torx screws, four more dc motors (the head drive motor being a large 20-watt Mabuchi RS-645VA-24135, the third being in the ink sump pump, and the fourth being the paper advance motor with a 600-count optical encoder disc), optical encoder grating tape, speaker, springs. Says there’s nothing of value in the paper tray and that the plastic is nonreusable, so in summary it’s “not worth your time”. #hoarding #bootstrapping #video
on 02024-04-03